Abstract
The paper describes the first super-critical once-through boiler to be installed in Great Britain. The unit is designed as a topping installation working in conjunction with a back pressure turbine exhausting into a medium pressure steam system
Reasons for the choice of critical pressure are given, followed by a note on the fuels used and their effect on design. The boiler and its auxiliary plant are then described together with the control system; a note is included on feed water
The operation of the boiler, including the method of starting up and shutting down, as well as some difficulties with tube faults, is described
The paper concludes with a statement that the boiler has fulfilled its purpose since it is extremely flexible in response to load changes, and is also capable of operation below the designed pressure and temperature, if required to do so.
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